package study.interfaces;

public class Demo1 {
    public static void main(String[] args) {

    }
}
class face implements face1{

    @Override
    public void func3() {

    }

    @Override
    public void fun4() {

    }
}
interface face1{
    // 1.7 版本
    //public int num1;
    //public static final int num2;
    int NUM3=10;
    public static final int NUM4=20;

    //public void func1(){}
    //public static void func2(){}

    public abstract void func3();
    void fun4();
}
